It was a sad day for Napoli and the club's fans. They conceived two goals in less than three minutes and these goals affected the morale of the Italian side. In the second half Napoli came out very strong and created few chances but Barca did a good defending job. Both teams deserved to win but Barca was just the lucky side. Napoli might start losing some of its key players because they might want to move to clubs that will play in European competitions. Victor Osimhen, Khvicha Kvaratskhelia and others might be on their way out of Napoli.
Napoli was badly affected by Spanish teams this season
They were in the same group as Real Madrid, and lost the two games they played against the Spanish team, finishing in second place...
then
...failing to finish in first place, they had to face Barcelona in the round of 16.
It was unlucky to fall into the same group as Real and be drawn against Barcelona
All in all, the team isn't at the same level as last year, when they were Italian champions with 90 points, and today they're in 7th place
Some players may be discouraged if there is any interest from bigger, more traditional teams in the UCL, I have to agree with you